CUED Publications database

Novel dual transient temperature modulation technique for multi-vapour detection

Iwaki, T and Covington, JA and Gardner, JW and Udrea, F (2009) Novel dual transient temperature modulation technique for multi-vapour detection. TRANSDUCERS 2009 - 15th International Conference on Solid-State Sensors, Actuators and Microsystems. pp. 592-595.

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Abstract

Here we present a novel signal processing technique for a square wave thermally-modulated carbon black/polymer composite chemoresistor. The technique consists of only two mathematical operations: summing the off-transient and on-transient conductance signals; and subtracting the steady-state conductance signal. A single carbon black/polyvinylpyrrolidone composite chemo -resistor was fabricated and used to demonstrate the validity of the technique. Classification of water, methanol and ethanol vapours was successfully performed using only the peak time of the resultant curves. Quantification of the different vapours was also possible using the height of the peaks, because it was linearly proportional to concentration. This technique does not require zero-gas calibration and thus is superior to previously reported methods. ©2009 IEEE.

Item Type: Article
Uncontrolled Keywords: Carbon black/polymer composite Gas sensor Micro-hotplate Temperature modulation
Subjects: UNSPECIFIED
Divisions: Div B > Electronics, Power & Energy Conversion
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 12:46
Last Modified: 27 Nov 2014 19:20
DOI: 10.1109/SENSOR.2009.5285394